Air-pump



.G. w. WRIGHT AND R. w; NICHOLS.

AIR PUMP;

APPLICATION FILED JUNE2 I| I920.

- Patentd 111116 7, 1921.

GEORGE w. WRIGHT, or LAPEL; AND RAYMOND wQnIoHons-or" Korean), whim;

AIR-MIME To all whom it may concern: 7

Be it known that we, GEORGE \V. WRIGHT and RAYMOND WV. NIoHons, citizens ofv the United States, residing at Lapel, inthe county of Madison and tate of Indiana, and Kokomo, in the county of Howard and State of Indiana, respectively, have invented a new and ,useful Air- Pump, of which the following is a specification, reference being had to the accompanyingdrawings, and to the figures ,ofrefe'rence marked thereon. v

This invention relates to a pump of the reciprocatory type, such as a single-acting portable pump, the invention having reference to pump construction generally and especially to the piston or plunger in pumps of the above-mentionedcharacter. V 4

Anpbject of the invention is to provide an efiicient and reliable pump of such constructionlas to be adapted forpumping and compressing air, and not liable to receivedust-ladcn air from a floor or ground and become damaged or deranged in'use orwhen roughly or carelesslyhandled. s Another object is to provide an improved air-pump which shall be of simple and inexpensive construction, and which will be ,highly efficient and durable and economical in use; an aim being to so construct the pump asto permit it to be readily repaired in case of necessity and torenew parts worn out by long use.

With the above-mentioned and other objects in view, the invention consists in an' verse section of the pump cylinder and bottom plan of the pump piston minus the valve thereof; and, Fig. 4: is a fragmentary longitudinal section in which the valve of the piston isshown in open posltlon.

Similar reference characters in the dilf'erent figures of the drawings indicate corresponding partsor. features of. construction herein referred to in detail.

Specification of Letters Patent. Plz'ttfin il edi'Jlll le Application filed June 21, 1920'. s riainouesaesafh i A practical embodiment o f theinveiition, 1

illustrated as a portable air-pump, comprises a base 1 having a-Icentral socket wall 2 thereon, one portion of the wall having a boss 3 thereon in which is a port 4:, the boss having a valve chamber 5 extending to the port and in which a spherical valve 6 is arrangedfor properly closing the port, the valve being retained in. the valve 'chamberby';means of a cage 7 screwed into the chamberandhaving a nipple Sthereon,- The ;cage-and-nip- I;

ple has an outlet channel!) therein for the discharge of air, and as .used fo r-a tir'e 'pump and for some other purposes flexible tube 1O is connected to-the nipple. gThe wall 2 preferably has screw threads llthereingg; hollow cylinder or barrel,12, is'provided and secured to, the base, lpreferablyfbeing provided with screw threads'i13 connectedwith the-threads 11, so that the base constitutes a closurefor the lower end of. the cylinder.

The upper or oppositeend'ofthe cylinderis provided with a caper head ldwhichis secured to the cylinder, preferably by means of screw threads l5 therein engaging threads 16, cut on the cylinder. The caphas a. vent or air hole 17 therein andalso a central guide- A hollow or tubular "pump; rodfl9'isprovided andarranged for longitudinal movean annular valve seat 2O onits' lower end the pump rod, and comprises anut 22 screwed ment in the guideway 18,1andpreferably; has 1,;

on the rod,a-head plate 23 arranged'against 1:

the nut,-.being cheaply made as a separate part, and a cup packing' of suitable material comprising a disk 24:. having an: expansible rim flange or ring25 thereon-and fitted to .the cylinder, the disk being against the head 5-,;

,plate. A follower, plate '26 is plac e'don lthe pump rod against the-disk 24:- and .a 111 5.27

is screwed onto the pum'p rod againstthe follower plate- The flange 25.,hasa beveled beengaged a. valve. 1 The pump rodiha's screw threads 29 extending from its opposite or outer end and a nut;3Q is arranged therea washer 34 is placed on the rodljagainst the handlebanand a nut 35 isfscrew'ed onto the rod against the washer. .A rod or pin, 36 '1 s or. conical valve seat 28 on its end'adapted-to v arranged in the puniprod in suitable openings so as to extend across the interior of the pump rod adjacent to the outer end of the rod. Preferably an annular cap 37 is se-,

cured on thepump "rod to cover the nut 85 and projecting ends of therod 36.

y A novel device is provided which constitutes a valve and, also apacking expander, and itcomprises a disk 38 having a bevel edge or valve portion 39, the disk being smaller in'diameter than the cylinder '12 to permit theflow of air past/it, and the valve portion is adapted to be seated on the valve seat 28 and to expand-the flange closely to the wall of tliecylinder 12 to prevent leakage of air pastthe flange. The packing cup,=in order to bedurab-le, is composed of firm ni'aterial, such as hard leather, or

fibrous compositions; :The disk is adapted to be seated alsoon the valve seat 20 after the valve hasger panded' the packing flange,

and insomecases the adjustment or propor- -tion may be s'uch as to permit contact of "the'valve withthe seat 20 only after considerable use and consequent wear ofthe packing,to insure proper valve action in case of leakage past the; valve seat 28." The disk 38 has a stem 40 rigid thereon which extends into the pump rod 19 andlhas an eye) 41 7 a djacent to its ,end,the stern being sufiioiently thinto permit freepassage of air through the-pump rod. Acoil spring s2 is arranged rnthe pump-rod and has a stem 43which is connected in the eye s1 with the stem 40, the spring having astem 44 011 its opposite end; Thesprlng stem 4:4: maybe variously itIlChQl'QCl'tOi the rod 19 but preferably has an, extensionstemwhich preferably is composed ofja'sep'arate: rod 45 having'an eye lGwhich is connectedto the stem 44, andhaving also 7 an eye 47 connected wlth the rod orcross bar 36 to! place the spring slightly under 7 "the feet of the operator who operates the:

itensionsufiicient to prevent the valve disk. 38 from loosely telling away fro nits valve seat. a t i In practicaluse the tube or conduit 10 is properly connected. with a pneumatic tire or otherwise wherecornpressed airiis to be delivered, the base l fmay be secured in a permanent pos tion or ,Illtl y beheld down by pump rod-,19 by means of the handle bar 32; or obviously the pump rod may be otherwiseoperated. As the pump rod is- I moved to draw the piston away from the base',-part1al vacuum is created between the valve disk 38 -an d the base and causes the valve 6 to beseated, if not seated by gravity,

and tthe valve disk is nnseated andpermits clean alrto pass throughthe pump rod and] past the valve andintot the lower portion of ithe' pump lcylinder, airliwhich maybe in the upper portion of the pump" cylinder, flowing past the packingfiange 'or escaping through the'vent l7 Whenthe motion is reversed andthe piston lt'orccdtoward the base the Y valve disk is seated onthe valve seat 2 8 and not only prevents air from escapnig back through the pump rod but expands the packing flange 25 against the cylinder wall,

air in the cylinder and forces it through the ort tand into any receptacle with which the. pump may be connected, further opaeration of the pump causing the 'air'to' be aressed in the tire or receptacle,

Qving thus described 'the invention, what is claimed as new is- 1 1. A pump including a'hollow cylinder, a piston head in the cylinder, a pump rod .in the cylinder having a hollow portion extendcom 'ing through andrigidlvsecured to the piston head, the'end of the hollow portion being open, a packing ring on th'e'piston head in connection with the cylinder, a valve removablyarranged 011 the/packing ring and the so that the piston causes compression of the r open end of they pumprod, and a' spring having connection with the v'alve and the pump rod and tensioned to yieldingly hold the valve in place, a

pump including a hollow cyllnder, a piston. head in-the-cylinder, a pump rod guided in the cylinder and having a hollow portionextending through and rigidly secured tothe piston head, the end ofthehollow portion being open,a packing ring on theplston head n connection with thecy'linder, a spring in the'hollo'w portion 'oiffthe pump rod and having one end connected to,

the rod, a valve stein loose in the hollow base, an outlet valve arranged in thebase,

ahollow cylinder secured atone end to the base, a guide cap secured to the opposite end 7 of the cylinder, a piston head in the cylinder, "a pump rod guided in the capand having a hollow'portion extending through and secured to the piston head, the end of the hollow portion being open, a packing ringsecured to the piston head in connection with the cylinder and hav ng a beveled edge to constitute a flexible valve seat, a disk valve valve stem and in "removable connection having a beveled edge to cooperate'withsaid valve seat and being adapted cooperate 'Withsaid open end of theipump rod, said valve having a stem. thereoneiitending into saidpump rod, and a coiled spring connected withsa'id stem" and with the pump rod and'tensioned to yieldingly'hold thegvalve V to the packing ring.

In'an alr-purnp, the combination or a base, an out-let valve arranged in the base, a

base, a cap secured to the opposite end of the cylinder and having a central guideway and also a vent hole therein, a tubular pump rod movable in said guideway and having a valve seat on, its inner end and a cross-bar adjacent to its outer end, two nuts on the pump rod in proximity to the inner end thereof, a piston head and a follower between the nuts, a packing disk between the piston head and the follower and having a rim flange thereon arranged against the cylinder, the rim flange having a beveled edge to constitute a valve seat, a diskvalve having a beveled edge to operate on the bevelededge of said flange, the disk valve being adapted to cooperate Withthe valve seat on the end of said pump rod and being provided with a stem'extending into said rod, a 'coiled spring connected with said stem and with said cross-bar, and aihandle bar secured to said pump rod adjacent to said cross-bar.

In testimony whereof we affix ourr signai- V tures in presence of two Witnesses.

GEORGE W.WVRIGHT. p RAYMOND W. NICHOLS. 7' V Witnesses E. T. SILvIUs, HOMER L, ARCHER. 

